Method and composition for bonding components to glass

• US 6,348,118 B1
• Filed: 02/06/1997
• Issued: 02/19/2002
• Est. Priority Date: 01/13/1995
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Pennycook, Jon M., Johnson, Michael A.
• Primary Examiner(s): Gallagher, John J.
• Application Number:
  US08/796,500
• Time in Patent Office: 1,839 Days
• Field of Search: 156/273.3, 156/273.5, 156/246, 156/64, 248/205.3, 248/467, 522/71, 522/103, 522/170
• US Class Current: 156/273.3
• CPC Class Codes: C03C 27/048 consisting of an adhesive specially adapted for that purpose
• CPC Class Codes: C03C 27/10 with the aid of adhesive specially adapted for that purpose
• CPC Class Codes: C09J 151/08 grafted on to macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds

Abstract

A method of bonding a component to glass comprising disposing a pressure-sensitive adhesive sheet material between said component and said glass so that said adhesive sheet material is adhered to said component and said glass, wherein said adhesive sheet material comprises the photopolymerization reaction product of starting materials comprising: (a) a monomeric mixture or partially prepolymerized syrup comprising at least one acrylic acid ester of an alkyl alcohol and at least one copolymerizable monomer; (b) an epoxy resin or a mixture of epoxy resins, (c) a heat-activatable hardener for the epoxy resin or mixture of epoxy resins, (d) a photoinitiator, and (e) a pigment.

Claims

1. A method of bonding a component to a surface comprising the steps of:

(a) disposing a thermosettable pressure sensitive adhesive composition between said component and said surface,

said pressure sensitive adhesive composition comprising

(i) the polymerization product of a monomeric or partially polymerized composition comprising at least one polymerizable acrylic or methacrylic acid ester of a non-tertiary alcohol;

(ii) a thermosettable epoxy resin; and

(iii) a pigment,

said polymerization product, said epoxy resin, said pigment, and the relative amounts thereof, being selected such that said pressure sensitive adhesive composition undergoes a detectable color change upon reaching a pre-determined level of cure; and

(b) curing said pressure sensitive adhesive composition until said composition undergoes a detectable color change to form a thermoset adhesive bonding said component to said surface.

2. A method according to claim 1 comprising curing said pressure sensitive adhesive composition by exposing said composition to heat.

3. A method according to claim 1 comprising curing said pressure sensitive adhesive composition by exposing said composition to ultraviolet radiation.

4. A method according to claim 1 comprising disposing said pressure sensitive composition between said component and a glass surface.

5. A method according to claim 1 wherein said pigment comprises carbon black or graphite.

6. A method according to claim 1 wherein said pressure sensitive adhesive composition further comprises a organofunctional silane.

7. A method according to claim 1 wherein said pressure sensitive adhesive composition comprises the polymerization product of a monomeric or partially polymerized composition comprising (a) from about 50 to about 95 parts by weight of at least one acrylic or methacrylic acid ester selected from the group consisting of isooctyl (meth)acrylate, isononyl (meth)acrylate, decyl (meth)acrylate, dodecyl (meth)acrylate, butyl (meth)acrylate, ethyl hexyl (meth)acrylate, and hexyl (meth)acrylate;

and (b) from about 50 to about 5 parts by weight of at least one copolymerizable monomer selected from the group consisting of isobornyl acrylate, N-vinyl caprolactam, N-vinyl pyrrolidone, N-vinyl piperidine, N,N-dimethylacrylamide, and acrylonitrile.

8. A method according to claim 1 comprising providing said pressure sensitive adhesive composition in the form of a sheet, and disposing said sheet between said component and said surface.

9. A method according to claim 1 comprising curing said pressure sensitive adhesive composition to form a thermoset adhesive having a tan delta value of greater than about 0.1 between a temperature range of about 0°

C. and 170°

C.

10. A method according to claim 1 comprising curing said pressure sensitive adhesive composition to form a thermoset adhesive having a storage modulus greater than about 2×

10⁷ between a temperature range of about−

40°

C. to 100°

C.

11. A method according to claim 1 wherein said thermosettable pressure sensitive adhesive composition flows during the curing step.

12. A method according to claim 1 comprising bonding a metal component to a glass surface.

13. A method according to claim 1 comprising bonding a mirror button to a glass surface.

14. A method according to claim 1 comprising curing said pressure sensitive adhesive composition until said composition undergoes a detectable color change to form a thermoset adhesive characterized by a color that is lighter than the color of said pressure sensitive adhesive composition.

15. A thermosettable pressure sensitive adhesive composition comprising:

(i) the polymerization product of a monomeric or partially polymerized composition comprising at least one polymerizable acrylic or methacrylic acid ester of a non-tertiary alcohol;

(ii) a thermosettable epoxy resin; and

(iii) a pigment,

said polymerization product, said epoxy resin, and said pigment, and the relative amounts thereof, being selected such that said pressure sensitive adhesive composition is capable of undergoing a detectable color change upon reaching a pre-determined level of cure.